Find in Library

The title borophosphate LiNi(H2O)2[BP2O8]·H2O was synthesized under hydrothermal conditions. The crystal structure is isotypic with the Mg analogue and features helical [BP2O8]3− borophosphate ribbons, constructed by BO4 (2 symmetry) and PO4 tetrahedra. The borate groups share all their oxygen apices with adjacent phosphate tetrahedra. The ribbons are connected via Ni2+ cations that are located on twofold rotation axes. The cations have a slightly distorted octahedral oxygen coordination by four O atoms from the anion and by two water molecules. The voids within the helices are occupied by Li+ cations, likewise located on twofold rotation axes, in an irregular environment of five O atoms. The structure is stabilized by O—H...O hydrogen bonds between coordinated or uncoordinated water molecules and O atoms that are part of the helices.